First identify the manner of death (homicide, suicide, accidental, or natural) for each of the following situations (a-f), then explain in detail your reasoning, and finally discuss what physical evidence may have been present at the crime scene and why.

a. Blunt force trauma to the back of the head

b. An elevated carboxyhemoglobin blood level in a fire victim

c. A fractured hyoid bone

d. Death by overdose of a first-time user of alcohol

e. A gunshot wound to the chest from a distance of 3 feet

f. Sudden death of a young chronic user of cocaine